US2416377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aromatic hydrocarcarbons by azeotropic distillation
Assignee: Beazer East Inc
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Filing: 1943-12-06
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Granted: 1947-02-25
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Expires: 1963-12-06
Abstract
No abstract record available.
Inventors
- 👤 Chadder William James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06; B; B01; B01D; B01D3/00; B01D3/14; B01D3/34; B01D3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1587188A
Cited
FR831295A
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GB513566A
Cited
US2342145A
Cited
US2360655A
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US2332493A
Cited
US2319694A
Cited
US2376870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-24 | 1950-08-26 | 1951-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-24 | 1954-08-26 | 1955-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-24 | 1958-08-26 | 1959-02-25 | $7700.00 | Window Closed / Lapsed |